CVE-2026-33216

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, for MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints. Versions 2.11.14 and 2.12.6 contain a fix. As a workaround, ensure monitoring end-points are adequately secured. Best practice remains to not expose the monitoring endpoint to the Internet or other untrusted network users.

Affected Software

Weaknesses

• CWE-256: CWE-256: Plaintext Storage of a Password

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

nats-server: github.com/nats-io/nats-server: NATS-Server: Information disclosure of MQTT passwords through monitoring endpoints

Additional References

• https://access.redhat.com/security/cve/CVE-2026-33216
• https://bugzilla.redhat.com/show_bug.cgi?id=2451448
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33216.json
• https://access.redhat.com/errata/RHSA-2026:22347
• https://access.redhat.com/errata/RHSA-2026:21769
• https://access.redhat.com/errata/RHSA-2026:23345

References

• https://github.com/nats-io/nats-server/security/advisories/GHSA-v722-jcv5-w7mc
• https://github.com/nats-io/nats-server/commit/b5b63cfc35a57075e09c1f57503d31721bed8099
• https://advisories.nats.io/CVE/secnote-2026-05.txt

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